A new spectroscopic mode identification method

Details A new spectroscopic mode identification method A new spectroscopic mode identification method

Jan 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006coast.147...56z&link_type=abstract

Communications in Asteroseismology, vol. 147, p. 56-60

Physics

Scientific paper

We present the Fourier parameter fit method, a new spectroscopic mode identification method for non-radially pulsating stars. It relies on a direct fit to the Fourier parameters zero point, amplitude and phase across the line profile. The quality of the obtained fits is quantified by means of a chi-square-goodness-of-fit test and the optimization is carried out with genetic algorithms permitting the search over a large parameter space. The displacement field adopted for the calculation of the theoretical Fourier parameters is valid in the limit of slow rotation and takes into account first order effects of the Coriolis force. We tested the method for low-degree modes (l <= 4) in a range of different settings of pulsational and stellar parameters. These tests showed that in general the azimuthal order m can be determined without ambiguity for modes with l <= 2, whereas the determination of l is generally affected by an error of +- 1.

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